230697821 has 2 divisors, whose sum is σ = 230697822. Its totient is φ = 230697820.

The previous prime is 230697811. The next prime is 230697851. The reversal of 230697821 is 128796032.

230697821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148596100 + 82101721 = 12190^2 + 9061^2 .

It is a cyclic number.

It is not a de Polignac number, because 230697821 - 2¹⁰ = 230696797 is a prime.

It is a super-2 number, since 2×230697821² = 106442969228296082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230697811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115348910 + 115348911.

It is an arithmetic number, because the mean of its divisors is an integer number (115348911).

Almost surely, 2^230697821 is an apocalyptic number.

It is an amenable number.

230697821 is a deficient number, since it is larger than the sum of its proper divisors (1).

230697821 is an equidigital number, since it uses as much as digits as its factorization.

230697821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 230697821 is about 15188.7399411538. The cubic root of 230697821 is about 613.3115792208.

The spelling of 230697821 in words is "two hundred thirty million, six hundred ninety-seven thousand, eight hundred twenty-one".